This points to a communication failure. Try using a shorter USB cable, switching to a USB 2.0 port on your computer, or running the tool as an Administrator.
Hold down the hidden reset button inside the AV jack and plug in the power supply. amlogic s805 firmware new
Hold the physical button down, plug in the power supply, and keep holding the button until the on-screen Android upgrade progress bar appears. Troubleshooting Common Flashing Errors This points to a communication failure